What was the SIZE of the Sheen or Iridescence Hawk-like bird you saw in Kansas?

Black Vulture: Large raptor, black overall, short, featherless neck, pale bill, short and squared tail, long, pale gray legs and feet. Gray-black skin on head and neck is wrinkled. White-tipped wings, held horizontal in flight. Soars on thermals, must flap its wings more often than a Turkey Vulture.